EP3063512B1 - Dispositif de détermination de la hauteur d'une surface de fluide dans un récipient de fluide - Google Patents

Dispositif de détermination de la hauteur d'une surface de fluide dans un récipient de fluide Download PDF

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Publication number
EP3063512B1
EP3063512B1 EP15728775.6A EP15728775A EP3063512B1 EP 3063512 B1 EP3063512 B1 EP 3063512B1 EP 15728775 A EP15728775 A EP 15728775A EP 3063512 B1 EP3063512 B1 EP 3063512B1
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EP
European Patent Office
Prior art keywords
fluid
sound
fluid container
deflection element
sound signals
Prior art date
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Application number
EP15728775.6A
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German (de)
English (en)
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EP3063512A1 (fr
Inventor
Karl-Friedrich Pfeiffer
Henning Grotevent
Claus Weber
Wighard JÄGER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vitesco Technologies GmbH
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Continental Automotive GmbH
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Publication date
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Publication of EP3063512A1 publication Critical patent/EP3063512A1/fr
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2962—Measuring transit time of reflected waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2968—Transducers specially adapted for acoustic level indicators
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning

Definitions

  • the invention relates to a device for determining a height of a fluid surface in a fluid container.
  • an acoustic measuring device can be used to determine a height of a fluid surface in a fluid container.
  • a sound transducer of the acoustic measuring device can work both as a sound generator and as a sound receiver.
  • sound pulses can be emitted into the fluid to be measured by means of the sound transducer.
  • the sound pulses can be reflected from an interface of the fluid to another medium.
  • Conclusions about the height of the fluid surface in the fluid container can be drawn from the transit time of the sound pulses.
  • the US 2003/140696 A discloses a piezoelectric liquid measurement system, particularly for fuel tanks for vehicles.
  • the system has piezoelectric means which are designed to emit and receive sound waves in a liquid in order to determine the distance of the path covered by the wave in the liquid on the basis of the time between emitting and receiving the wave.
  • the DE 10 2011 089 685 A1 discloses a measuring arrangement for determining a level and / or a concentration of a liquid.
  • the object on which the invention is based is to provide a device for determining a height of a fluid surface in a fluid container, which enables a reliable determination of the height of the fluid surface and at the same time can be produced inexpensively and efficiently.
  • the invention is characterized by a device for determining a height of a fluid surface in a fluid container.
  • the device comprises a first sound transducer for transmitting and receiving first sound signals.
  • the device further comprises a second sound transducer for transmitting and receiving second sound signals, the two Sound transducers are arranged on a bottom section of the fluid container in the same orientation.
  • the device comprises a reference element which is at a predetermined distance from the second sound transducer.
  • the reference element is arranged in a fluid space of the fluid container.
  • the device further comprises a deflection element which is arranged in the fluid space for deflecting the second sound signals by a predetermined angle in the direction of the one reference element.
  • the bottom section of the fluid container has at least one bulge with which the deflection element is mechanically coupled. The bulge projects into the fluid space. This enables a simple arrangement of the deflecting element.
  • the device comprises a control unit, which is designed to determine a speed of sound within a fluid in the fluid space as a function of the second sound signals.
  • the control unit is also designed to determine the height of the fluid surface above the bottom section of the fluid container depending on the first sound signals and the speed of sound within the fluid.
  • Such an arrangement of the two sound transducers enables a precise determination of the height at high fill levels and at low fill levels of, for example, less than 10%.
  • a beam path of the two sound transducers takes place independently of one another, for example.
  • the first sound transducer radiates directly in the direction of the fluid surface.
  • a determination of the speed of sound within the fluid enables a precise determination of a signal transit time.
  • an unobstructed, direct one is Propagation of the first sound signals advantageous in order to keep a signal power loss low. This enables a particularly large measuring range.
  • the arrangement of the two sound transducers in the bottom section of the fluid container in the same orientation has the advantage that only one assembly step is required, which contributes to cost-effective and efficient manufacture of the device. Furthermore, it is particularly advantageous, for example in the case of space restrictions, to arrange both sound transducers on the bottom section of the fluid container.
  • the two sound transducers are designed, for example, as piezo transducers. Assembly of the two sound transducers is made more difficult, for example, by their small size.
  • the arrangement of the two sound transducers on the bottom section of the fluid container advantageously contributes to the fact that the assembly is carried out precisely and efficiently. Furthermore, crossing acoustic paths of the two sound transducers leads to a particularly compact design of the device.
  • the bottom section is formed separately from side walls of the fluid container. This also contributes to simple installation of the two sound transducers, for example.
  • the deflection element is made of metal, ceramic or glass. Relative to the fluid in the fluid container, the deflection element thus has a high acoustic impedance. This enables a reliable deflection of the sound signals. Furthermore, this enables, for example, a robust arrangement of the deflection element as a free-standing component.
  • the deflection element is designed as a hollow body.
  • the deflection element is filled with air, a thermal expansion of the deflection element is advantageously reduced. Reduce further material costs and a weight of the device.
  • the hollow body is filled with air.
  • the deflection element thus has a low acoustic impedance. This advantageously enables the sound signals to be deflected reliably.
  • the deflection element deflects the second sound signals by 90 °. This contributes to a simple determination of the speed of sound.
  • the bulge is designed as a three-sided prism.
  • the first side surface of the three-sided prism is arranged coplanar with the bottom section of the fluid container.
  • the second side surface of the three-sided prism is arranged perpendicular to the bottom section of the fluid container and the third side surface of the prism is coupled to the deflection element.
  • the at least one bulge has a groove on a base surface arranged perpendicular to the base section of the fluid container for receiving the deflection element. This enables a free-standing arrangement of the deflecting element, whereby material, weight and in particular installation space can be saved.
  • Figure 1 shows a fluid container 1 with a bottom portion 3 and a fluid space 5, which is filled with a fluid F.
  • the fluid F is, for example, a liquid medium for reducing pollutants in exhaust gases, which preferably has a reducing agent and / or a reducing agent precursor, for example an aqueous urea solution.
  • a first sound transducer 10 and a second sound transducer 20 are arranged on the bottom section 3 of the fluid container 1.
  • the height H is defined as one Distance of the fluid surface 0 from the bottom section 3, measured in a neutral position of the fluid container 1, that is to say when the fluid container 1 is not inclined and the fluid surface 0 is parallel to the bottom section 3.
  • the height H can also be referred to as a fill level of the fluid container 1.
  • the two sound transducers 10, 20 are designed, for example, as piezo transducers and are coupled through a housing wall of the fluid container 1.
  • the housing wall is made of a plastic, such as so-called high-density polyethylene (HDPE), so that the bottom section 3 can be welded into the housing wall.
  • the two sound transducers 10, 20 are glued to the housing wall, for example, or pressed mechanically onto it, possibly also with a further intermediate layer in order to compensate for unevenness or roughness.
  • the first sound transducer 10 comprises a transmitter which emits first sound signals 12 in the direction of the fluid surface 0.
  • the first sound transducer 10 is oriented in such a way that a main radiation direction of the emitted first sound signals 12 is directed onto the fluid surface 0 perpendicular to the base section 3.
  • the fluid space 5 above the fluid F is filled with a further medium, such as air, so that the transmitted first sound signals 12 reflect at a transition of the fluid surface 0 to the air and reflected first sound signals 14 hit the first sound transducer 10.
  • the reflected first sound signals 14 are recorded by a receiver of the first sound converter 10.
  • a single piezo element can be used as a transmitter and receiver.
  • the alignment of the first sound transducer 10 also leads to a substantially perpendicular spread of the first reflected sound signals 14 the bottom section 3 of the fluid container 1.
  • the propagation of the first sound signals 12, 14 takes place directly, so that a drop in performance at obstacles is prevented and a determination of high fill levels of the fluid container 1 is thus made possible.
  • the second sound transducer 20 comprises a transmitter which emits second sound signals 22 and a receiver which receives reflected second sound signals 24. Crossing acoustic paths of the sound signals 12, 14 and 22, 24 leads to a particularly compact design of the device without significantly influencing the sound signals 12, 14, 22, 24.
  • a first reference element 30 and a second reference element 40 are arranged in the fluid space 5.
  • the two reference elements 30, 40 are preferably formed from a material that has a metal.
  • the two reference elements 30, 40 are formed from a piece of metal and are coupled to the bottom section 3 of the fluid container 1 by means of hot-pressed plastic noses.
  • the two reference elements 30, 40 reflect at least part of the emitted second sound signal 22.
  • the first reference element 30 is at a predetermined first distance from the second sound converter 20.
  • the second reference element 40 has a predefined one for the second sound transducer 20 second distance and in particular a precisely known distance from the reference element 30.
  • a transit time difference of the reflected second sound signals 24 is determined as a function of the known distance of the two reference elements 30, 40 from one another by means of a control unit, not shown, and a speed of sound in the fluid is dependent on the transit time difference F determined in the fluid container 1.
  • the height H of the fluid surface 0 can be determined via the bottom section 3 of the fluid container 1.
  • the second sound transducer 20 is arranged in the same orientation as the first sound transducer 10 on the bottom section 3 of the fluid container 1.
  • a deflection element 50 is arranged in the fluid space 5.
  • the deflection element 50 forms a 45 ° angle with the bottom section 3 of the fluid container 1, so that the second emitted sound signals 22 of the first section 22a, which are perpendicular to the bottom section 3, are deflected by 90 ° by the predetermined angle W and in a second section 22b reflect substantially parallel to the bottom section 3 from the deflection element 50 in the direction of the two reference elements 30, 40.
  • second sound signals 24 reflected by the two reference elements 30, 40, which in a first section 24a are essentially parallel to the floor section 3 run, deflected by 90 ° in the direction of the second sound transducer 20.
  • the deflection element 50 is formed, for example, from a piece of metal and has a high acoustic impedance relative to the acoustic impedance of the fluid F, so that a large part of the sound signals 22, 24 is reflected.
  • the deflection element 50 is arranged free-standing.
  • Two bulges 60, not shown here, of the base section 3 each have a groove which includes a 45 ° angle with the base section 3.
  • the two bulges 60 are arranged parallel to the image plane, so that the deflection element 50 can be inserted, for example, into the groove. This advantageously saves installation space, which for example increases a tank volume of the fluid space 5.
  • the bottom section 3 of the fluid container 1 has a single bulge 60 for the mechanical and acoustic coupling of the deflection element 50, on which the deflection element 50 rests.
  • the deflection element 50 is additionally mechanically fixed by an adhesive and / or welded connection.
  • the deflecting element 50 is integrated into the bulge 60, for example.
  • the bulge 60 is designed as a three-sided prism, the first side surface of which is arranged coplanar with the base section 3.
  • a second side surface of the three-sided prism is arranged perpendicular to the bottom section 3 of the fluid container 1 and a third side surface of the three-sided prism encloses a 45 ° angle with the bottom section 3, so that the deflection element 50 can be coupled to the bulge 60.
  • the deflection element 50 is designed as a cavity which is filled with air, for example. This has a low acoustic impedance relative to the fluid F in the fluid space 5, so that a large part of the sound signals 22, 24 is reflected.
  • the deflection element 50 is advantageously arranged in the bulge 60 of the bottom section 3 of the fluid container 1, so that no further component is required.
  • the bulge 60 includes an air inclusion in a cavity of the bulge 60, which is designed as a deflection element 50.
  • the height H of the fluid surface 0 of the fluid F in the fluid container 1 is determined analogously to the third exemplary embodiment Figure 3 ,
  • the two sound transducers 10, 20 are spatially separated from one another in such a way that the first sound signals 12, 14 and the second sound signals 22, 24 propagate separately, ie do not cross.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Claims (8)

  1. Dispositif pour déterminer une hauteur (H) d'une surface de fluide (O) dans un réservoir de fluide (1), comprenant
    - un premier transducteur acoustique (10) destiné à émettre et recevoir directement des premiers signaux sonores (12, 14) en direction de la surface de fluide, et un deuxième transducteur acoustique (20) destiné à émettre et recevoir des deuxièmes signaux sonores (22, 24), les deux transducteurs acoustiques (10, 20) étant disposés dans la même orientation à l'extérieur de l'espace à fluide au niveau d'une portion de fond (3) du réservoir de fluide (1),
    - un élément de référence (30, 40) qui possède un écart prédéfini par rapport au deuxième transducteur acoustique (20) et qui est disposé dans un espace à fluide (5) du réservoir de fluide (1),
    - un élément de déviation (50) qui est disposé dans l'espace à fluide (5) pour dévier les deuxièmes signaux sonores (22, 24) d'un angle (W) prédéfini en direction de l'élément de référence (30, 40),
    et
    - une unité de commande qui est configurée pour identifier une vitesse du son à l'intérieur d'un fluide (F) dans l'espace à fluide (5) en fonction des deuxièmes signaux sonores (22, 24) et pour identifier la hauteur (H) de la surface de fluide (O) au-dessus de la portion de fond (3) du réservoir de fluide (1) en fonction des premiers signaux sonores (12, 14) et de la vitesse du son à l'intérieur du fluide (F),
    caractérisé en ce que
    la portion de fond (3) du réservoir de fluide (1) possède au moins une indentation (60) qui fait saillie dans l'espace à fluide (5) et avec laquelle l'élément de déviation (50) est couplé mécaniquement.
  2. Dispositif selon la revendication 1, avec lequel la portion de fond (3) est configurée séparément des parois latérales du réservoir de fluide (1).
  3. Dispositif selon la revendication 1 ou 2, avec lequel l'élément de déviation (50) est réalisé en métal, en céramique ou en verre.
  4. Dispositif selon la revendication 1 ou 2, avec lequel l'élément de déviation (50) est réalisé sous la forme d'un corps creux.
  5. Dispositif selon la revendication 4, avec lequel le corps creux est rempli d'air.
  6. Dispositif selon l'une des revendications précédentes, avec lequel l'élément de déviation (50) dévie les deuxièmes signaux sonores (22, 24) de 90°.
  7. Dispositif selon l'une des revendications précédentes, avec lequel l'au moins une indentation (60) est réalisée sous la forme d'un prisme triangulaire dont la première face latérale est disposée de manière coplanaire à la portion de fond (3) du réservoir de fluide (1), dont la deuxième face latérale est disposée perpendiculairement à la portion de fond (3) du réservoir de fluide (1) et dont la troisième face latérale est couplée avec l'élément de déviation (50).
  8. Dispositif selon l'une des revendications précédentes, avec lequel l'au moins une indentation (60) possède, au niveau d'une surface de base disposée perpendiculairement à la portion de fond (3) du réservoir de fluide (1), une rainure destinée à accueillir l'élément de déviation (50).
EP15728775.6A 2014-05-27 2015-05-26 Dispositif de détermination de la hauteur d'une surface de fluide dans un récipient de fluide Active EP3063512B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014210080.1A DE102014210080A1 (de) 2014-05-27 2014-05-27 Vorrichtung zum Bestimmen einer Höhe einer Fluidoberfläche in einem Fluidbehälter
PCT/EP2015/061493 WO2015181105A1 (fr) 2014-05-27 2015-05-26 Dispositif de détermination de la hauteur d'une surface de fluide dans un récipient de fluide

Publications (2)

Publication Number Publication Date
EP3063512A1 EP3063512A1 (fr) 2016-09-07
EP3063512B1 true EP3063512B1 (fr) 2019-12-18

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Country Link
US (1) US10444057B2 (fr)
EP (1) EP3063512B1 (fr)
KR (1) KR20160102551A (fr)
CN (1) CN106415218B (fr)
DE (1) DE102014210080A1 (fr)
WO (1) WO2015181105A1 (fr)

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DE102014210080A1 (de) 2014-05-27 2015-12-03 Continental Automotive Gmbh Vorrichtung zum Bestimmen einer Höhe einer Fluidoberfläche in einem Fluidbehälter
DE102018202209B3 (de) 2018-02-13 2019-05-29 Continental Automotive Gmbh Vorrichtung zum Bestimmen einer Höhe und/oder Qualität eines Fluids in einem Fluidbehälter
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DE102018214300A1 (de) 2018-08-23 2020-02-27 Continental Automotive Gmbh Verfahren zum Betreiben einer Fluidsensorvorrichtung und Fluidsensorvorrichtung
DE102018214291A1 (de) 2018-08-23 2020-02-27 Continental Automotive Gmbh Verfahren zum Betreiben einer Fluidsensorvorrichtung und Fluidsensorvorrichtung
DE102018214294B4 (de) 2018-08-23 2022-07-14 Vitesco Technologies GmbH Verfahren zum Betreiben einer Fluidsensorvorrichtung und Fluidsensorvorrichtung
DE102018214293A1 (de) 2018-08-23 2020-02-27 Continental Automotive Gmbh Verfahren zum Betreiben einer Fluidsensorvorrichtung und Fluidsensorvorrichtung
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Also Published As

Publication number Publication date
US20170089751A1 (en) 2017-03-30
KR20160102551A (ko) 2016-08-30
WO2015181105A1 (fr) 2015-12-03
CN106415218A (zh) 2017-02-15
EP3063512A1 (fr) 2016-09-07
CN106415218B (zh) 2019-12-13
DE102014210080A1 (de) 2015-12-03
US10444057B2 (en) 2019-10-15

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